Answer : 1. "इसरो"
Explanation :

ISRO announced a significant advancement in rocket engine technology by unveiling the lightweight carbon-carbon (Si-Si) nozzle developed by Vikram Sarabhai Space Center (VSSC). This breakthrough promises to boost payload capacity by increasing critical parameters such as thrust level, specific impulse and thrust-to-weight ratio. Taking advantage of advanced materials such as carbon-carbon composites, VSSC designed a nozzle divergent with exceptional properties, leading to improved launch vehicle performance.